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The GLAS/ICESat 1 km Laser Altimetry Digital Elevation Model of Greenland, Version 1 provides surface elevation grids derived from satellite laser altimetry. Produced by NSIDC, this dataset covers all of Greenland south of 83° N with measurements collected between February 2003 and June 2005. It offers elevation data relative to both the WGS 84 ellipsoid and EGM96 geoid, with fewer slope-related effects than radar altimetry.
License is listed as 'other-license-specified' but the specific terms are not detailed. Data is distributed in 4-byte signed integer binary files (big endian byte order) with ENVI headers, requiring compatible geospatial tools. Available via FTP.